Dear Pammy,
I am sorry to hear you are going through a rough spot with a lot piled on at once. I, like you, feel grateful to be alive and having almost died a few times but with human nature I start taking my existence for granted too often.
As for weight, it isn't so much important. I find , how much I eat, but what and when. In fact, eating too little tends to slow my metabolism, don't know about yours. Sometimes, too, having a very tiny amount of something wonderful can kind of spark up the day. Imagine you find just one chocolate M and M candy. It's tiny. You might ordinarily want thirty or so of them. But if you had the one, you would be surprised and delighted and maybe pause more in the tasting of it, maybe take a while for the candy sheel to dissolve before getting to the chocolate, maybe think about the flavour, maybe even disdain it by thinking about the artificial coloring. But, in all its tiny imperfection, it would be a momentary joy